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Enzyme

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proteins that speed up chemical reactions

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Chemical reactions

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Changing substances by breaking and forming bonds (includes hydrolysis and dehydration reactions)

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Energy

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the capacity for doing work

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Activation energy

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the energy needed to start a chemical reaction

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Reactants

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the substances changed during a chemical reaction (goes into the process)

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Products

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the substances made by a chemical reaction (comes out of the process)

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Catalysts

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substance that speeds up the rate of a chemical reaction

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Substrate

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reactant of an enzyme-catalyzed reaction

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Active site

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the region of an enzyme that attaches to a substrate

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Denature

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a change in the shape of a protein (such as an enzyme) that can be caused by changes in temperature or pH (among other things).